EJB 3.0 JPA: java.lang.NullPointerException at JdbcOdbcDriver.initialize()

Question

Hello every body,
I'm trying to implement EJB 3.0 JPA .
The entities Users ,and Products are created ,
and the client is as shown below:
package com.prapansol.demos;
import java.util.List;
import javax.ejb.EJB;
import com.xyz.demos.ejb30.Users;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.persistence.PersistenceContext;
public class Client {
private EntityManager manager;
public Client() {
EntityManagerFactory emf = Persistence.createEntityManagerFactory("EJB");
EntityManager em=emf.createEntityManager();
this.setEntityManager(em);
/** <code>select o from Users o</code> */
public List<Users> queryUsersFindAll() {
List<Users> users =null;
try{
users= getEntityManager().createNamedQuery("Users.findAll").getResultList();
//@NamedQuery(name = "Users.findAll", query = "select o from Users o") has been defined in Users entity
}catch(Exception e){
System.out.println(e.getClass().getName());
System.out.println(e.getMessage());
e.printStackTrace();
return users;
public void shutDown(){
getEntityManager().close();
public void setEntityManager(EntityManager manager) {
this.manager = manager;
public EntityManager getEntityManager() {
return manager;
public static void main(String[] args) {
Client client = new Client();
List<Users> users=client.queryUsersFindAll();
     for(Users user : users ){System.out.println(""+user.getFirstName()+user.getLastName()); }
The persistence.xml file is:
<?xml version="1.0" encoding="UTF-8" ?>
<persistence xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"
version="1.0" xmlns="http://java.sun.com/xml/ns/persistence">
<persistence-unit name="EJB">
<provider>oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider</provider>
<class>com.xyz.demos.ejb30.Users</class>
<class>com.xyz.demos.ejb30.Products</class>
<class>com.xyz..demos.ejb30.ServiceRequests</class>
<class>com.xyz.demos.ejb30.ServiceHistories</class>
<class>com.xyz.demos.ejb30.ExpertiseAreas</class>
<properties>
<property name="jdbc.driver" value="oracle.jdbc.driver.OracleDriver"/>
<property name="jdbc.connection.string" value="jdbc:oracle:thin:@localhost:1521:ORCL"/>
<property name="jdbc.user" value="scott"/>
<property name="jdbc.password" value="tiger"/>
<property name="toplink.logging.level" value="INFO"/>
</properties>
</persistence-unit>
</persistence>
Here are the log messages :
[TopLink Finest]: 2007.03.23 01:36:15.095--ServerSession(32012057)--Thread(Thread[main,5,main])--property=toplink.weaving; value=true
[TopLink Config]: 2007.03.23 01:36:15.323--ServerSession(32012057)--Thread(Thread[main,5,main])--The alias name for the entity class [class com.prapansol.demos.technology.Users] is being defaulted to: Users.
[TopLink Config]: 2007.03.23 01:36:15.335--ServerSession(32012057)--Thread(Thread[main,5,main])--The table name for entity [class com.prapansol.demos.technology.Users] is being defaulted to: USERS.
[TopLink Config]: 2007.03.23 01:36:15.360--ServerSession(32012057)--Thread(Thread[main,5,main])--The column name for element [private java.lang.String com.prapansol.demos.technology.Users.city] is being defaulted to: CITY.
[TopLink Config]: 2007.03.23 01:36:15.377--ServerSession(32012057)--Thread(Thread[main,5,main])--The column name for element [private java.lang.String com.prapansol.demos.technology.Users.email] is being defaulted to: EMAIL.
[TopLink Config]: 2007.03.23 01:36:15.431--ServerSession(32012057)--Thread(Thread[main,5,main])--The alias name for the entity class [class com.prapansol.demos.technology.ServiceHistories] is being defaulted to: ServiceHistories.
[TopLink Config]: 2007.03.23 01:36:15.435--ServerSession(32012057)--Thread(Thread[main,5,main])--The column name for element [private java.lang.String com.prapansol.demos.technology.ServiceHistories.notes] is being defaulted to: NOTES.
[TopLink Config]: 2007.03.23 01:36:15.456--ServerSession(32012057)--Thread(Thread[main,5,main])--The alias name for the entity class [class com.prapansol.demos.technology.ServiceRequests] is being defaulted to: ServiceRequests.
[TopLink Config]: 2007.03.23 01:36:15.460--ServerSession(32012057)--Thread(Thread[main,5,main])--The column name for element [private java.lang.String com.prapansol.demos.technology.ServiceRequests.status] is being defaulted to: STATUS.
[TopLink Config]: 2007.03.23 01:36:15.461--ServerSession(32012057)--Thread(Thread[main,5,main])--The alias name for the entity class [class com.prapansol.demos.technology.Products] is being defaulted to: Products.
[TopLink Config]: 2007.03.23 01:36:15.464--ServerSession(32012057)--Thread(Thread[main,5,main])--The table name for entity [class com.prapansol.demos.technology.Products] is being defaulted to: PRODUCTS.
[TopLink Config]: 2007.03.23 01:36:15.466--ServerSession(32012057)--Thread(Thread[main,5,main])--The column name for element [private java.lang.String com.prapansol.demos.technology.Products.description] is being defaulted to: DESCRIPTION.
[TopLink Config]: 2007.03.23 01:36:15.466--ServerSession(32012057)--Thread(Thread[main,5,main])--The column name for element [private java.lang.String com.prapansol.demos.technology.Products.image] is being defaulted to: IMAGE.
[TopLink Config]: 2007.03.23 01:36:15.467--ServerSession(32012057)--Thread(Thread[main,5,main])--The column name for element [private java.lang.String com.prapansol.demos.technology.Products.name] is being defaulted to: NAME.
[TopLink Config]: 2007.03.23 01:36:15.468--ServerSession(32012057)--Thread(Thread[main,5,main])--The alias name for the entity class [class com.prapansol.demos.technology.ExpertiseAreas] is being defaulted to: ExpertiseAreas.
[TopLink Config]: 2007.03.23 01:36:15.470--ServerSession(32012057)--Thread(Thread[main,5,main])--The column name for element [private java.lang.String com.prapansol.demos.technology.ExpertiseAreas.notes] is being defaulted to: NOTES.
[TopLink Config]: 2007.03.23 01:36:15.574--ServerSession(32012057)--Thread(Thread[main,5,main])--The target entity (reference) class for the one to many mapping element [private java.util.List com.prapansol.demos.technology.ServiceRequests.serviceHistoriesList] is being defaulted to: class com.prapansol.demos.technology.ServiceHistories.
[TopLink Config]: 2007.03.23 01:36:15.579--ServerSession(32012057)--Thread(Thread[main,5,main])--The target entity (reference) class for the many to one mapping element [private com.prapansol.demos.technology.ServiceRequests com.prapansol.demos.technology.ServiceHistories.serviceRequests] is being defaulted to: class com.prapansol.demos.technology.ServiceRequests.
[TopLink Config]: 2007.03.23 01:36:15.592--ServerSession(32012057)--Thread(Thread[main,5,main])--The target entity (reference) class for the one to many mapping element [private java.util.List com.prapansol.demos.technology.Users.serviceHistoriesList] is being defaulted to: class com.prapansol.demos.technology.ServiceHistories.
[TopLink Config]: 2007.03.23 01:36:15.593--ServerSession(32012057)--Thread(Thread[main,5,main])--The target entity (reference) class for the many to one mapping element [private com.prapansol.demos.technology.Users com.prapansol.demos.technology.ServiceHistories.users] is being defaulted to: class com.prapansol.demos.technology.Users.
[TopLink Config]: 2007.03.23 01:36:15.593--ServerSession(32012057)--Thread(Thread[main,5,main])--The target entity (reference) class for the one to many mapping element [private java.util.List com.prapansol.demos.technology.Users.expertiseAreasList] is being defaulted to: class com.prapansol.demos.technology.ExpertiseAreas.
[TopLink Config]: 2007.03.23 01:36:15.594--ServerSession(32012057)--Thread(Thread[main,5,main])--The target entity (reference) class for the many to one mapping element [private com.prapansol.demos.technology.Users com.prapansol.demos.technology.ExpertiseAreas.users] is being defaulted to: class com.prapansol.demos.technology.Users.
[TopLink Config]: 2007.03.23 01:36:15.594--ServerSession(32012057)--Thread(Thread[main,5,main])--The target entity (reference) class for the many to one mapping element [private com.prapansol.demos.technology.Products com.prapansol.demos.technology.ExpertiseAreas.products] is being defaulted to: class com.prapansol.demos.technology.Products.
[TopLink Config]: 2007.03.23 01:36:15.595--ServerSession(32012057)--Thread(Thread[main,5,main])--The target entity (reference) class for the one to many mapping element [private java.util.List com.prapansol.demos.technology.Products.expertiseAreasList] is being defaulted to: class com.prapansol.demos.technology.ExpertiseAreas.
[TopLink Finer]: 2007.03.23 01:36:15.600--ServerSession(32012057)--Thread(Thread[main,5,main])--Weaver processing class [com.prapansol.demos.technology.Users].
[TopLink Finer]: 2007.03.23 01:36:15.601--ServerSession(32012057)--Thread(Thread[main,5,main])--Weaver processing class [com.prapansol.demos.technology.ServiceHistories].
[TopLink Finer]: 2007.03.23 01:36:15.601--ServerSession(32012057)--Thread(Thread[main,5,main])--Weaver processing class [com.prapansol.demos.technology.ServiceRequests].
[TopLink Finer]: 2007.03.23 01:36:15.601--ServerSession(32012057)--Thread(Thread[main,5,main])--Weaver processing class [com.prapansol.demos.technology.ExpertiseAreas].
[TopLink Finer]: 2007.03.23 01:36:15.602--ServerSession(32012057)--Thread(Thread[main,5,main])--Weaver processing class [com.prapansol.demos.technology.Products].
[TopLink Finer]: 2007.03.23 01:36:15.604--Thread(Thread[main,5,main])--cmp_init_globalInstrumentation_is_null
[TopLink Finest]: 2007.03.23 01:36:15.613--ServerSession(32012057)--Thread(Thread[main,5,main])--begin deploying Persistence Unit EJB; state Predeployed; deploymentCount 0
[TopLink Finest]: 2007.03.23 01:36:15.633--ServerSession(32012057)--Thread(Thread[main,5,main])--property=toplink.logging.level; value=FINEST; translated value=FINEST
[TopLink Finest]: 2007.03.23 01:36:15.634--ServerSession(32012057)--Thread(Thread[main,5,main])--property=toplink.logging.level; value=FINEST; translated value=FINEST
[TopLink Info]: 2007.03.23 01:36:15.639--ServerSession(32012057)--Thread(Thread[main,5,main])--TopLink, version: Oracle TopLink Essentials - 2006.8 (Build 060829)
[TopLink Finest]: 2007.03.23 01:36:15.646--ServerSession(32012057)--Thread(Thread[main,5,main])--end deploying
Persistence Unit EJB; state Undeployed; deploymentCount 0
Here is the Stack Trace:
Exception in thread "main" java.lang.NullPointerException
     at sun.jdbc.odbc.JdbcOdbcDriver.initialize(JdbcOdbcDriver.java:436)
     at sun.jdbc.odbc.JdbcOdbcDriver.connect(JdbcOdbcDriver.java:153)
     at java.sql.DriverManager.getConnection(DriverManager.java:525)
     at java.sql.DriverManager.getConnection(DriverManager.java:140)
     at oracle.toplink.essentials.sessions.DefaultConnector.connect(DefaultConnector.java:85)
     at oracle.toplink.essentials.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:170)
     at oracle.toplink.essentials.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:537)
     at oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:180)
     at oracle.toplink.essentials.internal.ejb.cmp3.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:230)
     at oracle.toplink.essentials.internal.ejb.cmp3.base.EntityManagerFactoryImpl.getServerSession(EntityManagerFactoryImpl.java:84)
     at oracle.toplink.essentials.internal.ejb.cmp3.base.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:127)
     at oracle.toplink.essentials.internal.ejb.cmp3.base.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:121)
     at oracle.toplink.essentials.internal.ejb.cmp3.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:76)
     at com.prapansol.demos.Client.<init>(Client.java:29)
     at com.prapansol.demos.Client.main(Client.java:83)
where am I doing wrong?
Why does sun.jdbc.odbc.JdbcOdbcDriver.initialize method get called when I'm using Oracle DataBase?
Am I missing any thing ?
I'll be thankful if any one help me find my fault?
Thanking you in Advance,
Regards,
Samba

Answer 1

Check the property names for configuring TopLink's internal connection pool. All of the JDBC property names should be prefixed with toplink.
Refer to the TopLink JPA extensions guide for more information.
http://www.oracle.com/technology/products/ias/toplink/jpa/resources/toplink-jpa-extensions.html
Doug